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Old 07-18-2003, 05:20 PM
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Holley Carb Tuning

Hello everyone.
I am hoping to get some knowledge from those of you who are used to adjusting holley carbs.
I have a 327 with a 750 holley on it and it runs really rich at an idle. I have just sort of got the truck together right now so have not had a lot of time to test drive or play with it.
The 327 is freshly rebuilt with double bumps,comp 274 cam,performer intake and hei dist.
What I wonder is about the two adjusting screws I see on the sides of the carb. I imagine one is air adjustment and the other would be fuel. Am I right? Now if so which is which and how can I go about adjusting them?
I do intend to have a guy go through the engine later and fine tune it but right now need to run it a bit to look for any problems that might come up as the truck is all freshly assembled.
Oh Yeah, I forgot to say it,s a 55 Chevy truck with a turbo 400 and 2500 stall convertor. The whole thing has been rebuilt or replaced over the last two years. That being said hopefully someone has an idea how to stop that carb from being so rich.
Some of you will tell me to get a smaller carb but I have run a 750 Holley on a 327 before with great results,however I know nothing about tuning them. Please help!!
Thanks in advance for any info to help me get some driving in this summer!

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Old 07-18-2003, 05:51 PM
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The screws you mention control the volume of fuel the carb pulls out of the idle well.....clockwise will make it leaner and counter clockwise will fatten it up........Holley.com has a pretty good Tech section you should check out for more info.......good luck..
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Old 07-18-2003, 06:43 PM
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The Knowledge Base has the information that you want on a Holly
Here's Hollys site with a free downloadable manual and trouble shooters guide. It will help you with all your questions.
http://www.holley.com/HiOctn/TechSer...o/FMCTech.html
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Old 07-18-2003, 10:00 PM
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Thanks a lot Guy's!
I checked out that Holley site and followed the simple directions. She seems to run a lot better now. Thanks again for your advice.
This is one awesome website!
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Old 07-19-2003, 10:03 AM
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Please let us know how it run's when your done tuning it.
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